I had one but it was too small for my needs. I usually end up carrying a DSi XL or two in addition to my iPad and BT keyboard.
It is a great bag. Looks beautiful. Functions perfectly. I also would recommend it to someone.
I had considered getting the 13" model, but feel that may be a bit too big for my needs. My perfect bag has been 12" wide and 11" tall.
BTW, Hey, Tom. Glad you are enjoying the bag.